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The present study investigated a possible relationship between plasma neurotensin (NT) and serum growth hormone (GH) levels after GH-stimulation provocative tests in humans. Samples were obtained from twelve prepubertal children and sixteen normal adult volunteers. Basal plasma NT levels were higher in children with growth delay (19.02 +/- 4.01 fmol/ml) (mean +/- SEM) than in normal adults (6.13 +/- 1.1 fmol/ml) (p &lt; 0.001). Basal GH levels in children (1.52 +/- 0.06 ng/ml) were not different from those in adults (0.60 +/- 0.41 ng/ml). After stimulation of GH secretion, NT values decreased when GH peaked, and increased when GH levels diminished. These data suggest that plasma NT levels may be involved in the regulation of GH secretion, as a peripheral signal, probably through modulation of somatostatin release from the median eminence.

Plasma Neurotensin Levels in Prepubertal Children and Adults: Possible Involvement in the Regulation of Growth Hormone Secretion